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| Titel |
Model sensitivity to North Atlantic freshwater forcing at 8.2 ka |
| VerfasserIn |
C. Morrill, A. N. LeGrande, H. Renssen, P. Bakker, B. L. Otto-Bliesner |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 2 ; Nr. 9, no. 2 (2013-04-10), S.955-968 |
| Datensatznummer |
250018030
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| Publikation (Nr.) |
 copernicus.org/cp-9-955-2013.pdf |
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| Zusammenfassung |
| We compared four simulations of the 8.2 ka event to assess climate model
sensitivity and skill in responding to North Atlantic freshwater
perturbations. All of the simulations used the same freshwater forcing, 2.5 Sv for one year, applied to either the Hudson Bay
(northeastern Canada) or Labrador Sea (between Canada's Labrador coast and Greenland). This
freshwater pulse induced a decadal-mean slowdown of 10–25% in the
Atlantic Meridional Overturning Circulation (AMOC) of the models and caused
a large-scale pattern of climate anomalies that matched proxy evidence for
cooling in the Northern Hemisphere and a southward shift of the
Intertropical Convergence Zone. The multi-model ensemble generated
temperature anomalies that were just half as large as those from
quantitative proxy reconstructions, however. Also, the duration of AMOC and
climate anomalies in three of the simulations was only several decades,
significantly shorter than the duration of ~150 yr in the
paleoclimate record. Possible reasons for these discrepancies include
incorrect representation of the early Holocene climate and ocean state in
the North Atlantic and uncertainties in the freshwater forcing estimates. |
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